US5626574A - Disposable diaper - Google Patents

Disposable diaper Download PDF

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Publication number
US5626574A
US5626574A US08/354,134 US35413494A US5626574A US 5626574 A US5626574 A US 5626574A US 35413494 A US35413494 A US 35413494A US 5626574 A US5626574 A US 5626574A
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United States
Prior art keywords
diaper
welded
front
patterns
transversely
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Expired - Lifetime
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US08/354,134
Inventor
Tohru Sasaki
Toshifumi Ohtsubo
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Uni-Charm Corp
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Uni-Charm Corp
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Publication date
Priority to JP1993066021U priority Critical patent/JP2580207Y2/en
Priority to JP5-066021U priority
Application filed by Uni-Charm Corp filed Critical Uni-Charm Corp
Assigned to UNI-CHARM CORPORATION reassignment UNI-CHARM CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SASAKI, TOHRU, OHTSUBO, TOSHIFUMI
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • A61F13/4963Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs characterized by the seam
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/20Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/306Applying a mark during joining
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/306Applying a mark during joining
    • B29C66/3062Applying a mark during joining in the form of letters or numbers
    • B29C66/30621Applying a mark during joining in the form of letters or numbers in the form of letters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/433Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729Textile or other fibrous material made from plastics
    • B29C66/7294Non woven mats, e.g. felt
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/20Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/221Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a sinusoidal wave
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/20Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/223Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a triangle wave or of a sawtooth wave, e.g. zigzagged
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/431Joining the articles to themselves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/70General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B29C66/72343General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer for liquids
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/48Wearing apparel
    • B29L2031/4871Underwear
    • B29L2031/4878Diapers, napkins

Abstract

A disposable diaper of pants type having front and rear bodies bonded to each other by series of welded zones along transversely opposite sides of front and rear waist sections, wherein the welded zones are at least partially defined by patterns of V-shape or patterns of V-shape being devoid of a sharp point, both laid down transversely of the diaper, or patterns of an arc opening transversely of the diaper.

Description

BACKGROUND OF THE INVENTION

The present invention relates to a disposable diaper, more particularly to a disposable diaper formed in pants type.

It is well known for disposable diapers formed in pants type comprising heat-weldable top- and backsheets to seal front and rear bodies to each other by means of heat welding along transversely opposite sides of front and rear waist sections. For example, Japanese Laid-Open Patent Application No. 1993-15551, of which the applicant is the same as the applicant of the present application, discloses a sealing technique for pants type diapers, by which a series of intermittent rectangular welded zones each having a long side extending in parallel to a waist line of the diaper are longitudinally arranged along each lateral side of the front and rear waist sections utilizing an ultrasonic welding. Use of this technique enables the diaper put on a wearer to be easily stripped off merely tearing off the diaper along the sealed side edges of the diaper. This technique is advantageous also in that the interior of the diaper is always maintained in good communication with the exterior of the diaper and thereby the diaper of high air-permeability is obtained.

Tearing off tends to take place along a peripheral edge of each welded zone as the diaper is torn off. The sheets usually used to form the diaper comprise a thin nonwoven fabric or a plastic film of a relatively small weight per unit area and a correspondingly low tear strength, since, after the sheets have been welded to each other, the welded zone exhibits a tear strength higher than that exhibited by the nonwelded zone and a tearing force is concentrated along a boundary between the welded zone and the nonwelded zone. Consequently, there is an apprehension that a tear might progress circumferentially, i.e., transversely into the front and/or rear bodies as the diaper is torn off along the long side of each rectangular welded zone, instead of being torn longitudinally of the diaper. Such undesirable phenomenon will readily occur particularly when both the top- and backsheets exhibit a lower tear strength in transverse direction significantly than a tear strength in longitudinal direction. Unless the diaper is torn off in the longitudinal direction, it will be impossible to relieve the wearer from the diaper as quickly as possible.

Accordingly, a principal object of the invention to solve the problem as has been mentioned above by providing a diaper with welded zones at least partially defined by patterns each having contours diverging transversely of the diaper so that the diaper may be easily torn off along such contours obliquely downwards.

SUMMARY OF THE INVENTION

To achieve the object set forth above, the invention broadly resides in a disposable diaper comprising a liquid-permeable topsheet, a liquid-impermeable backsheet sandwiched between these two heat-weldable sheets, and having front and rear bodies sealed to each other along transversely opposite sides of front and rear waist sections, defined by portions extending outwards from transversely opposite side edges of said liquid-absorbent core in said front and rear bodies by series of intermittent welded zones arranged longitudinally along the respective waist side portions.

The invention is characterized in that the welded zones are at least partially defined by patterns each having an outer contour formed substantially in a V-shape laid down transversely of the diaper, said outer contour comprising that of an arc opening transversely of said diaper as a modified form thereof.

With the disposable diaper constructed as has been described above, the top- and backsheets are torn off obliquely along contours of each welded zone diverging transversely of the diaper, instead of being torn off circumferentially of the waist, as the waist side portions are torn off.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be readily apparent from the following description of preferred embodiments in reference with the accompanying drawing, in which:

FIG. 1 is a perspective view showing a disposable diaper;

FIG. 2 is a perspective view showing the diaper as developed in longitudinal direction;

FIG. 3 is a fragmentary plan view showing an embodiment of welded zones in the diaper in an enlarged scale;

FIG. 4 is a view similar to FIG. 3 showing another embodiment of the welded zones;

FIG. 5 is a view similar to FIG. 3 showing another embodiment of the welded zones; and

FIG. 6 is a view similar to FIG. 3 showing still another embodiment of the welded zones.

PREFERRED EMBODIMENTS OF THE INVENTION

Referring to FIGS. 1 and 2, a blank 1A of a diaper 1 comprises a liquid-permeable topsheet 2, a liquid-impermeable backsheet 3 and a liquid-absorbent core 4 sandwiched between these two sheets 2, 3, and is generally composed of a front body 5, a rear body 6 and a crotch zone 7. The topsheet 2 is formed by a nonwoven fabric of thermoplastic fibers, the backsheet 3 is formed by a thermoplastic film, and these two sheets 2, 3 are heat-weldable to each other. Referring to FIG. 2, portions of the top- and backsheets 2, 3 extending outwards from the peripheral edge of the liquid-absorbent core 4 are itermittently bonded to each other by means of adhesive (not shown) in the diaper blank 1A. The diaper blank 1A may be folded inwards in two along a longitudinally middle line X--X and transversely opposite side edges of the front and rear bodies 5, 6 formed by portions of the top- and backsheets 2, 3 extending outwards from transversely opposite side edges of the liquid-absorbent core 4 and lying one upon another may be sealed together by series of welded zones 10 intermittently provided along the respective side edges to form the diaper 1 into pants type. The diaper 1 thus formed has a waist-opening 11 and a pair of leg-openings 12. These openings 11, 12 are provided along their peripheries with a plurality of parallel elastic members 13, 14 bonded to said peripheries, respectively, in their stretched condition.

Referring to FIG. 3, the elastic members 13 shown in the upper portion of the waist side edge is associated with the waist-opening 11 and the elastic members 14 shown in the lower portion of the waist side edge is associated with the leg-openings 12. The welded zones 10 comprise first rectangular welded patterns 17 intermittently provided between each pair of adjacent the elastic members 13 for the waist-opening and adjacent the uppermost elastic member 13 and having their long sides 17A extending in parallel to the elastic members 13, second rectangular welded patterns 18 intermittently provided between each pair of adjacent the elastic members 14 for the leg-openings and adjacent the lowermost elastic member 14 and having their long sides 18A extending in parallel to the elastic members 14 and third laid down V-shaped welded patterns 19 intermittently provided between the lowermost elastic member 13 and the uppermost elastic member 14. Each of said first and second welded patterns 17, 18 is a rectangular welded zone dimensioned to be 0.3 to 2×3 to 10 mm (height×length) and each of the third welded patterns 19 is a V-shaped welded zone described by a welded line being 0.3 to 1.5 mm wide and dimensioned to have an included angle C=15 to 90° and a length D=3 to 10 mm. All of the welded patterns 17, 18, 19 are spaced by d=0.5 to 3 mm one from another and non-welded zones defined between each pair of adjacent patterns contribute to promote a fluid communication between interior and exterior of the diaper, improving the desired air-permeability of the diaper.

With the diaper 1 shown by FIG. 1, the diaper 1 can be torn off longitudinally down along the welded zones 10 by pulling the front and rear bodies 5, 6 in directions as indicated by arrows A, B with the waist-opening gripped in hands and thereby a wearer can be easily relieved from the diaper 1. The welded zones 10 of the diaper 1 generally have a tear strength higher than that of the top- and backsheets 2, 3, so the top- and backsheets 2, 3 are torn off along the outer peripheries of the first, second and third welded patterns 17, 18, 19 as the front and rear bodies are pulled in the directions A, B. In other words, the top- and backsheets 2, 3 tend to be torn off transversely along the first and second welded patterns 17, 18 and tend to be torn off in V-shape along each of the third welded patterns 19 and thereby to be obliquely downwards torn off in zigzags along the series of V-shaped patterns 19. Particularly when fibers and/or polymers in the top- and backsheets 2, 3 are oriented transversely of the diaper 1 and these sheets 2, 3 tend to be torn off transversely of the diaper due to such orientation, there is an apprehension that the sheets 2, 3 might be torn off along the first and second welded patterns 17, 18 into the front and/or rear bodies. However, according to this embodiment of the diaper 1, the first and second welded patterns 17, 18 are located as adjacent as possible to the elastic members 13 for the waist-opening and the elastic members 14 for the leg-openings so that such apprehension may be minimized and the major portions of the respective waist side edges are sealed only by the third welded patterns 19 so that the top- and backsheets 2, 3 may be easily torn off longitudinally but not transversely of the diaper 1. While it is possible to replace the first and second welded patterns 17, 18 by the third welded patterns 19, the V-shaped patterns 19 might cross and cut the elastic members 13, 14 or the elastic members 13, 14 might impede quick welding of the top- and backsheets 2, 3 depending on the distance by which the elastic members 13, 14 are spaced one from another, respectively.

FIGS. 4, 5 and 6 are views similar to FIG. 3 showing various embodiments of the third welded pattern 19. Referring to FIG. 4, the laid down V-shaped third welded pattern 19 diverges towards the center of the diaper 1. The V-shape may be devoid of its sharp point. Referring to FIG. 5, the third welded pattern 19 is an arc opening transversely of the diaper 1 and its orientation is alternated, which is a modified form of the V-shaped pattern 19 shown in FIGS. 3 and 4. Referring to FIG. 6, the third welded pattern 19 is a rhombus formed by two laid down V-shaped contours one of which diverge towards the center of the diaper 1 and the other diverge in the opposite direction. While the third welded patterns 19 may be continuous one to another, instead of being intermittently arranged as exemplarily shown by FIGS. 3 through 6, such continuous arrangement of the third welded patterns 19 will deteriorate the air-permeability of the diaper 1.

According to the invention, the heat-weldable top- and backsheets 2, 3 may be subjected to embossing or ultrasonic welding to obtain the first, second and third welded patterns 17, 18, 19. The topsheet 2 may be formed by a nonwoven fabric made of thermoplastic fibers or a porous thermoplastic film and the backsheet 3 may be formed by a thermoplastic film, a nonwoven fabric or a laminate of a nonwoven fabric and a plastic film. The liquid-absorbent core 4 may be formed by the well known materials conventionally used for this component.

In the disposable diaper according to the invention, the front and rear bodies are welded together along the transversely opposite side edges of the front and rear waist sections and this welding is achieved by the welded zones comprising the intermittent patterns each having contours of V-shape or V-shape devoid of its sharp point, both laid down transversely of the diaper or patterns each having contours of circular arc opening transversely of the diaper. Accordingly, when the diaper is torn off along the waist side edges to relieve a wearer from the diaper, the top- and backsheets are torn off obliquely downwards along said contours rather than being torn off circumferentially of the waist. In this manner, no failure of tearing off occurs.

Claims (6)

What is claimed is:
1. A disposable diaper comprising:
a liquid-permeable topsheet;
a liquid-impermeable backsheet;
a liquid-absorbent core sandwiched between said topsheet and said backsheet;
the topsheet, backsheet and core forming a front body and a rear body, said front and rear bodies separated longitudinally by a crotch zone;.
the diaper having front and rear bodies seamed to each other by a series of intermittent welded zones having first and second side edges and arranged along transversely opposite side portions of said front and rear bodies, the transversely opposite side portions being defined by portions of the front and rear bodies extending outwardly from transversely opposite side edges-of said core;
the diaper having a plurality of elastic members along peripheries of at least one of a waist-opening and a pair of leg openings, wherein a first generally rectangular weld pattern including a plurality of intermittent generally rectangular welds is provided at said transversely opposite side portions of said front and rear bodies with one of said plurality of intermittent rectangular welds disposed between pairs of adjacent elastic members with long sides of the first generally rectangular welds generally parallel to the elastic members; and
wherein welded patterns define each of said welded zones, each welded pattern having an outer contour portion defined by outer edges, said outer edges being spaced apart at said second side edge and being connected to each other at said first side edge;
the combination of rectangular welds and welded patterns along the intermittent welded zones permitting the diaper to be torn off a user longitudinally along the welded zones.
2. A disposable diaper according to claims 1, wherein said outer contour portion is formed substantially in a V-shape laid down transversely of the diaper.
3. A disposable diaper according to claim 2, herein said V-shape is devoid of a sharp point.
4. A disposable diaper according to claim 1, wherein said outer contour portion is formed in an arc shape opening transversely of the diaper.
5. A disposable diaper according to claim 1, wherein said outer contour portion is formed in a rhombus.
6. A disposable diaper according to claim 1, wherein said welded zones defined by said patterns are provided between uppermost one of elastic members provided along peripheries of a waist-opening of the diaper and lowermost one of elastic members provided along peripheries of leg-openings of the diaper.
US08/354,134 1993-12-10 1994-12-06 Disposable diaper Expired - Lifetime US5626574A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1993066021U JP2580207Y2 (en) 1993-12-10 1993-12-10 Disposable pants-type diaper
JP5-066021U 1993-12-10

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US6022431A (en) 1998-06-19 2000-02-08 Kimberly-Clark Worldwide, Inc. Method of making prefastened absorbent articles having a stretch band
US6022432A (en) 1998-06-19 2000-02-08 Kimberly-Clark Worldwide, Inc. Method of making prefastened disposable absorbent articles
US6022430A (en) 1998-06-19 2000-02-08 Kimberly-Clark Worldwide, Inc. Method of making absorbent articles having an adjustable belt
US6036805A (en) 1998-06-19 2000-03-14 Kimberly-Clark Worldwide, Inc. Method of making an asborbent article with prefastened side panels
US6113717A (en) 1998-12-18 2000-09-05 Kimberly-Clark Worldwide, Inc. Method of making refastenable, pant-like disposable absorbent articles
US6322552B1 (en) 1998-06-19 2001-11-27 Kimberly-Clark Worldwide, Inc. Absorbent articles having belt loops and an adjustable belt
US6387083B1 (en) * 1998-06-30 2002-05-14 Uni-Charm Corporation Pull-on disposable diaper
US6402731B1 (en) 1997-08-08 2002-06-11 Kimberly-Clark Worldwide, Inc. Multi-functional fastener for disposable absorbent articles
US6454752B1 (en) 2000-03-17 2002-09-24 Kimberly-Clark Worldwide, Inc. Pre-fastened adjustable mechanical fastener garment
US20020165517A1 (en) * 2001-03-01 2002-11-07 Kimberly-Clark Worldwide, Inc. Prefastened diaper/pant for infants with improved fit range
US6508797B1 (en) 2000-11-03 2003-01-21 Kimberly-Clark Worldwide, Inc. Pant-like disposable absorbent articles with a releasable line of weakness and a fastener
US6524293B1 (en) 1999-12-17 2003-02-25 Kimberly-Clark Worldwide, Inc. Prefastened disposable absorbent articles having a stretch panel
US6537403B1 (en) 2001-12-18 2003-03-25 Kimberly-Clark Worldwide, Inc. Nip adjustment for a rigid ultrasonic bonder or processor
US6547903B1 (en) 2001-12-18 2003-04-15 Kimberly-Clark Worldwide, Inc. Rotary ultrasonic bonder or processor capable of high speed intermittent processing
US6551294B1 (en) 1999-12-17 2003-04-22 Kimberly-Clark Worldwide Disposable absorbent articles having a stretch panel and an integrated waist size adjustment mechanism
US6569139B1 (en) 2000-06-22 2003-05-27 Kimberly-Clark Worldwide, Inc. Disposable absorbent underpants for containing body fluid
US6572601B2 (en) 1999-06-04 2003-06-03 Kimberly-Clark Worldwide, Inc. Disposable absorbent articles having an adjustable, pretensioned waistband fastening system
US6579275B1 (en) 2000-09-28 2003-06-17 Kimberly-Clark Worldwide, Inc. Pant-like disposable absorbent articles with releasable seams and a folded fastening feature
US20030120240A1 (en) * 1998-05-28 2003-06-26 The Procter & Gamble Company Disposable pant-type diaper having improved protection against red marking
US6613171B2 (en) 2001-12-18 2003-09-02 Kimberly-Clark Worldwide, Inc. Rotary ultrasonic bonder or processor capable of fixed gap operation
US6620270B2 (en) 2001-12-18 2003-09-16 Kimberly-Clark Worldwide, Inc. Control of processing force and process gap in rigid rotary ultrasonic systems
US6676003B2 (en) 2001-12-18 2004-01-13 Kimberly-Clark Worldwide, Inc. Rigid isolation of rotary ultrasonic horn
US20050029315A1 (en) * 2002-10-07 2005-02-10 Justrite Manufacturing Company Safety can
US20050055001A1 (en) * 1997-11-17 2005-03-10 Cazzato Tim Richard Disposable absorbent underpants
US20050055005A1 (en) * 1997-11-17 2005-03-10 Cazzato Tim Richard Disposable absorbent underpants
US20050090788A1 (en) * 2003-10-24 2005-04-28 Uni-Charm Corporation Disposable wearing article
WO2008008004A1 (en) * 2006-07-13 2008-01-17 Sca Hygiene Products Ab A seam joining together at least web materials
US20080021424A1 (en) * 2005-09-30 2008-01-24 Edward Erdman Side seams for absorbent articles
US20080140038A1 (en) * 2006-12-08 2008-06-12 Uni-Charm Corporation Absorbent article
US7473818B2 (en) 2001-03-01 2009-01-06 Kimberly-Clark Worldwide, Inc. Product seal of dissimilar materials
WO2009082277A1 (en) 2007-12-20 2009-07-02 Sca Hygiene Products Ab A seam joining together at least two web materials
US20090312734A1 (en) * 2008-06-17 2009-12-17 Gary Dean Lavon Absorbent Article
EP2153810A1 (en) * 2007-05-24 2010-02-17 Uni-charm Corporation Absorptive article
US20100179494A1 (en) * 2007-05-30 2010-07-15 Uni-Charm Corporation Absorptive article
US20100217218A1 (en) * 2006-06-21 2010-08-26 Sca Hygiene Products Ab Belted absorbent garment
US8206366B2 (en) 2001-03-01 2012-06-26 Kimberly-Clark Worldwide, Inc. Convertible diaper/pant with ease of application
US8852161B2 (en) 2006-06-21 2014-10-07 Sca Hygiene Products Ab Belted absorbent garment
US20140378930A1 (en) * 2004-09-02 2014-12-25 The Procter & Gamble Company Absorbent Article Having A Folded Waist
US9326899B2 (en) 2012-05-15 2016-05-03 The Procter & Gamble Company Absorbent articles having texture zones forming background patterns and macro patterns
US20170049639A1 (en) * 2014-04-28 2017-02-23 Unicharm Corporation Underpants-type absorbent article

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EP0839507A1 (en) * 1996-10-30 1998-05-06 THE PROCTER & GAMBLE COMPANY Opening tab for disposable pull-on diapers
JP2000502941A (en) * 1997-05-30 2000-03-14 ザ、プロクター、エンド、ギャンブル、カンパニー On clothing - disposable pull with improved handling at the time of disposal after soiling
JP2004520961A (en) 2000-08-30 2004-07-15 キンバリー クラーク ワールドワイド インコーポレイテッド Tear resistance of the adhesive / combination bonding pattern
US6717028B1 (en) * 2000-08-30 2004-04-06 Kimberly-Clark Worldwide, Inc. Bond pattern
EP1530452A2 (en) * 2002-08-22 2005-05-18 Kimberly-Clark Worldwide, Inc. Absorbent article having dual pattern bonding
US20060135936A1 (en) * 2004-12-22 2006-06-22 Markovich Stacy N Absorbent garment having sensory cue for line of weakness
WO2007036909A1 (en) * 2005-09-29 2007-04-05 The Procter & Gamble Company Side seam for disposable garment
DE102006046420A1 (en) * 2006-09-22 2008-04-03 Paul Hartmann Ag Hygiene article or surgical covering item, or surgical clothing items for single use
JP4490405B2 (en) * 2006-09-29 2010-06-23 大王製紙株式会社 Pants-type disposable diapers
US8518006B2 (en) * 2008-05-30 2013-08-27 Kimberly-Clark Worldwide, Inc. Personal wear absorbent article with tab
SG174270A1 (en) * 2009-03-23 2011-10-28 Kao Corp Underwear-type absorbent article
JP5400556B2 (en) * 2009-10-13 2014-01-29 花王株式会社 Pants-type disposable diapers
JP5575500B2 (en) * 2010-02-10 2014-08-20 ユニ・チャーム株式会社 Group of articles including a disposable wearing article
JP5566833B2 (en) * 2010-09-28 2014-08-06 大王製紙株式会社 Pants-type disposable diapers
JP5438139B2 (en) * 2012-01-20 2014-03-12 大王製紙株式会社 Pants-type disposable diapers
CN102871803A (en) * 2012-09-18 2013-01-16 金红叶纸业集团有限公司 Disposable absorbing product
JP6444798B2 (en) * 2015-03-31 2018-12-26 ユニ・チャーム株式会社 Disposable wearing articles
JP6456220B2 (en) * 2015-03-31 2019-01-23 ユニ・チャーム株式会社 Disposable wearing articles

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Cited By (59)

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US6402731B1 (en) 1997-08-08 2002-06-11 Kimberly-Clark Worldwide, Inc. Multi-functional fastener for disposable absorbent articles
US20050055001A1 (en) * 1997-11-17 2005-03-10 Cazzato Tim Richard Disposable absorbent underpants
US20050055005A1 (en) * 1997-11-17 2005-03-10 Cazzato Tim Richard Disposable absorbent underpants
US8257334B2 (en) * 1998-05-28 2012-09-04 The Procter & Gamble Company Disposable pant-type diaper having improved protection against red marking
US9114043B2 (en) 1998-05-28 2015-08-25 The Procter & Gamble Company Disposable pull-on garment having improved protection against red marking and method for making the same
US9173780B2 (en) 1998-05-28 2015-11-03 The Procter & Gamble Company Disposable garment
US20030120240A1 (en) * 1998-05-28 2003-06-26 The Procter & Gamble Company Disposable pant-type diaper having improved protection against red marking
US6036805A (en) 1998-06-19 2000-03-14 Kimberly-Clark Worldwide, Inc. Method of making an asborbent article with prefastened side panels
US6022430A (en) 1998-06-19 2000-02-08 Kimberly-Clark Worldwide, Inc. Method of making absorbent articles having an adjustable belt
US6022432A (en) 1998-06-19 2000-02-08 Kimberly-Clark Worldwide, Inc. Method of making prefastened disposable absorbent articles
US6022431A (en) 1998-06-19 2000-02-08 Kimberly-Clark Worldwide, Inc. Method of making prefastened absorbent articles having a stretch band
US6322552B1 (en) 1998-06-19 2001-11-27 Kimberly-Clark Worldwide, Inc. Absorbent articles having belt loops and an adjustable belt
US6387083B1 (en) * 1998-06-30 2002-05-14 Uni-Charm Corporation Pull-on disposable diaper
US6000056A (en) * 1998-07-10 1999-12-14 Brady; Dennis P. Disposable bib adapted to carry articles for use in feeding
US6113717A (en) 1998-12-18 2000-09-05 Kimberly-Clark Worldwide, Inc. Method of making refastenable, pant-like disposable absorbent articles
US6572601B2 (en) 1999-06-04 2003-06-03 Kimberly-Clark Worldwide, Inc. Disposable absorbent articles having an adjustable, pretensioned waistband fastening system
US6524293B1 (en) 1999-12-17 2003-02-25 Kimberly-Clark Worldwide, Inc. Prefastened disposable absorbent articles having a stretch panel
US6551294B1 (en) 1999-12-17 2003-04-22 Kimberly-Clark Worldwide Disposable absorbent articles having a stretch panel and an integrated waist size adjustment mechanism
US6454752B1 (en) 2000-03-17 2002-09-24 Kimberly-Clark Worldwide, Inc. Pre-fastened adjustable mechanical fastener garment
US6569139B1 (en) 2000-06-22 2003-05-27 Kimberly-Clark Worldwide, Inc. Disposable absorbent underpants for containing body fluid
US6579275B1 (en) 2000-09-28 2003-06-17 Kimberly-Clark Worldwide, Inc. Pant-like disposable absorbent articles with releasable seams and a folded fastening feature
US6508797B1 (en) 2000-11-03 2003-01-21 Kimberly-Clark Worldwide, Inc. Pant-like disposable absorbent articles with a releasable line of weakness and a fastener
US8206366B2 (en) 2001-03-01 2012-06-26 Kimberly-Clark Worldwide, Inc. Convertible diaper/pant with ease of application
US7473818B2 (en) 2001-03-01 2009-01-06 Kimberly-Clark Worldwide, Inc. Product seal of dissimilar materials
US20020165517A1 (en) * 2001-03-01 2002-11-07 Kimberly-Clark Worldwide, Inc. Prefastened diaper/pant for infants with improved fit range
US6547903B1 (en) 2001-12-18 2003-04-15 Kimberly-Clark Worldwide, Inc. Rotary ultrasonic bonder or processor capable of high speed intermittent processing
US6620270B2 (en) 2001-12-18 2003-09-16 Kimberly-Clark Worldwide, Inc. Control of processing force and process gap in rigid rotary ultrasonic systems
US6613171B2 (en) 2001-12-18 2003-09-02 Kimberly-Clark Worldwide, Inc. Rotary ultrasonic bonder or processor capable of fixed gap operation
US6537403B1 (en) 2001-12-18 2003-03-25 Kimberly-Clark Worldwide, Inc. Nip adjustment for a rigid ultrasonic bonder or processor
US6676003B2 (en) 2001-12-18 2004-01-13 Kimberly-Clark Worldwide, Inc. Rigid isolation of rotary ultrasonic horn
US20050029315A1 (en) * 2002-10-07 2005-02-10 Justrite Manufacturing Company Safety can
US7527617B2 (en) * 2003-10-24 2009-05-05 Uni-Charm Corporation Disposable wearing article
US7915477B2 (en) 2003-10-24 2011-03-29 Uni-Charm Corporation Disposable wearing article
US20050090788A1 (en) * 2003-10-24 2005-04-28 Uni-Charm Corporation Disposable wearing article
US20140378930A1 (en) * 2004-09-02 2014-12-25 The Procter & Gamble Company Absorbent Article Having A Folded Waist
US9622920B2 (en) * 2004-09-02 2017-04-18 The Proctor & Gamble Company Absorbent article having a folded waist
US20080021424A1 (en) * 2005-09-30 2008-01-24 Edward Erdman Side seams for absorbent articles
US8852161B2 (en) 2006-06-21 2014-10-07 Sca Hygiene Products Ab Belted absorbent garment
US20100217218A1 (en) * 2006-06-21 2010-08-26 Sca Hygiene Products Ab Belted absorbent garment
US8057457B2 (en) 2006-06-21 2011-11-15 Sca Hygience Products Ab Belted absorbent garment
US8197458B2 (en) * 2006-07-13 2012-06-12 Sca Hygiene Products Ab Seam joining together at least two web materials
WO2008008004A1 (en) * 2006-07-13 2008-01-17 Sca Hygiene Products Ab A seam joining together at least web materials
US20090292266A1 (en) * 2006-07-13 2009-11-26 Sca Hygience Products Ab Seam joining together at least two web materials
US20080140038A1 (en) * 2006-12-08 2008-06-12 Uni-Charm Corporation Absorbent article
US8986274B2 (en) * 2006-12-08 2015-03-24 Uni-Charm Corporation Absorbent article having joint regions
US20100174258A1 (en) * 2007-05-24 2010-07-08 Uni-Charm Corporation Absorptive article
CN101677882B (en) 2007-05-24 2013-03-27 尤妮佳股份有限公司 Absorptive article
EP2153810A1 (en) * 2007-05-24 2010-02-17 Uni-charm Corporation Absorptive article
EP2153810A4 (en) * 2007-05-24 2011-04-13 Uni Charm Corp Absorptive article
US20100179494A1 (en) * 2007-05-30 2010-07-15 Uni-Charm Corporation Absorptive article
US8449519B2 (en) 2007-12-20 2013-05-28 Sca Hygiene Products Ab Seam joining together at least two web materials
WO2009082277A1 (en) 2007-12-20 2009-07-02 Sca Hygiene Products Ab A seam joining together at least two web materials
US8551064B2 (en) 2008-06-17 2013-10-08 The Procter & Gamble Company Absorbent article
US20090312734A1 (en) * 2008-06-17 2009-12-17 Gary Dean Lavon Absorbent Article
US9326899B2 (en) 2012-05-15 2016-05-03 The Procter & Gamble Company Absorbent articles having texture zones forming background patterns and macro patterns
US9333119B2 (en) 2012-05-15 2016-05-10 The Procter & Gamble Company Absorbent articles having textured zones
US9375361B2 (en) 2012-05-15 2016-06-28 The Procter & Gamble Company Absorbent articles having a belt portion with a texture zone having a texture ratio
US9867740B2 (en) 2012-05-15 2018-01-16 The Procter & Gamble Company Absorbent articles having texture zones forming background patterns and macro patterns
US20170049639A1 (en) * 2014-04-28 2017-02-23 Unicharm Corporation Underpants-type absorbent article

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CN2223090Y (en) 1996-03-27
DE69408640D1 (en) 1998-04-02
CA2137520A1 (en) 1995-06-11
CA2137520C (en) 1999-06-15
AU8022394A (en) 1995-06-15
DE69408640T2 (en) 1998-06-18
SG54186A1 (en) 1998-11-16
JP2580207Y2 (en) 1998-09-03
JPH0734814U (en) 1995-06-27
ES2112492T3 (en) 1998-04-01
EP0657153A3 (en) 1995-08-23
AU688399B2 (en) 1998-03-12
KR0116498Y1 (en) 1998-04-20
PH31135A (en) 1998-03-03
EP0657153A2 (en) 1995-06-14
EP0657153B1 (en) 1998-02-25

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